I have implemented your suggestion.

I don't tested it, but I suppose, that you should set both closeAfterAdd:true and closeAfterEdit:true beacuse the code of Add and Edit will be shared. You can also try to use recreateForm:true which is a standard settings in my code.

By the way you can change the default settings for this parameters with

Best regards
Oleg

Everything is working fine, except the form window won't disappear after a successful edit.

Here is my code:

$(document).ready(function(){

var dataquery = '';
var qq = '';
var qcolheads = '';

jQuery("#membergrid").jqGrid({     
       url:'php/pmembers.php?q=1',
    datatype: "json",
    userdata: "userData",
    jsonReader : {
    userdata: "userData"
    },
       colNames:['id', 'first','M', 'last','since','email','home','cell','1º activity','2º activity', 'wikiid','username','A','P'],
       colModel:[
           {name:'id',index:'id', width:20,editable:true,editoptions:{readonly:true,size:5,class:'readonly'}},
           {name:'firstname',index:'firstname', width:70,editable:true,editoptions:{readonly:false,size:20}},
           {name:'middlename',index:'middlename', width:5,editable:true,editoptions:{readonly:false,size:5}},
           {name:'lastname',index:'lastname', width:75,editable:true,editoptions:{readonly:false,size:20}},
           {name:'membersince',index:'membersince', width:35,editable:true,editoptions:{readonly:false,size:20}},
           {name:'user_email',index:'user_email', width:150,editable:true,editoptions:{readonly:false,size:30}},
           {name:'homephone',index:'homephone', width:80,editable:true,editoptions:{readonly:false,size:20}},
           {name:'cellphone',index:'cellphone', width:80,editable:true,editoptions:{readonly:false,size:20}},
           {name:'activity1',index:'activity1', width:150,editable:true,edittype: "select", editoptions:{dataUrl:'php/pmembers.php?q=2'} },
           {name:'activity2',index:'activity2', width:150,editable:true,edittype: "select", editoptions:{dataUrl:'php/pmembers.php?q=2'} },
           {name:'wiki_id',index:'wiki_id', width:20,editable:true,editoptions:{readonly:true,size:20,class:'readonly'}},
           {name:'wiki_user_name',index:'wiki_user_name', width:130,editable:true,editoptions:{readonly:true,size:20,class:'readonly'}},
           {name:'active',index:'active', width:10,editable:true,editoptions:{readonly:false,size:10}},
           {name:'paiddues',index:'paiddues', width:10,editable:true,editoptions:{readonly:false,size:10}}           
       ],
       rowNum:10,
       rowList:[10,20,30],
       pager: '#membernav',
       sortname: 'id',
    viewrecords: true,
    sortorder: "asc",
    caption:"members",    
    loadComplete: function() {
        var qu = jQuery('#membergrid').jqGrid('getGridParam','userData');
        var qq = qu['query'];
        qcolheads = qu['columnheadings'];
         },
     editurl:"php/pmembers.php?q=3"
});

jQuery("#membergrid").jqGrid('navGrid','#membernav',{edit:true,add:false,del:false},{reloadAfterSubmit: true, closeOnEscape: true,afterSubmit:processEdit,closeAfterEdit: true,closeAfterSubmit: true});
jQuery("#membergrid").jqGrid('navButtonAdd','#membernav',
    {caption:"print",
    id:"exportbutton",
    onClickButton:function()
            {
                jQuery("#membergrid").jqGrid('excelExport',{url:'php/pmembers.php?q=4&qq='+qq+'&qcolheads='+qcolheads,tag:'text'});
            }
    });
    
function processEdit(response, postdata) {
               if (response.responseText == "Success") {
                return [true, response.responseText]
            }
            else{
                return[false, response.responseText]
            }
        }

}); // end page load